Herculaneum, past, present & future . such marking should prove impracticable, firmly adhesivelabels would be attached. To every section a photographer is attached. His workis so arranged that at every spot at which a separate gangis working he takes a photograph at fixed intervals. Thenegative itself is marked with the section and gang number,the date and the running number of the periodical view taken :D, Vn. 12/4, 6, 10 means that the negative shows the workat Section D, Gang VII., on April 12, the sixth round ofthe photographer at 10 oclock before noon. These negativesare at once taken to
Herculaneum, past, present & future . such marking should prove impracticable, firmly adhesivelabels would be attached. To every section a photographer is attached. His workis so arranged that at every spot at which a separate gangis working he takes a photograph at fixed intervals. Thenegative itself is marked with the section and gang number,the date and the running number of the periodical view taken :D, Vn. 12/4, 6, 10 means that the negative shows the workat Section D, Gang VII., on April 12, the sixth round ofthe photographer at 10 oclock before noon. These negativesare at once taken to the developing shed and are developed,while, with the least delay, three prints are at once taken,the mark being visible on the right-hand corner. Betweenthese periodical photographings, special photographs are takenof important objects at every stage of their discovery andemergence from the earth. We shall see in the next chapter that a diiferent colour is needed to mark theobjects in their grouping as objects—vases, statues, BRONZE TRIIOU. Plate 41. CHAP. Ill DURING EXCAVATION 165 Other kinds of illustrations are also frequently demanded tobe made at once and on the spot. So, for instance, it is fearedthat the fresh and beautiful colour of a wall-painting or of somedefinite object may fade. One of the artists is called by tele-phone, and at once makes a faithful sketch in water-colour oroils, to be added to the day-book record, and fixes the state of thecolours at the moment of its first discovery. In many instancesthe chemists have to be called in to determine how such delicateobjects are to be handled. Most thorough preliminary experi-ments have been made, and are still being carried on, as tothe exact nature of the colours used in the different worksby the ancients. It is then decided whether a certain objectmay or may not be exposed to the light ; whether it is at onceto be encased in glass, the air being excluded ; whether a glassis at once to be placed in front
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